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FLRT3 Marks Direction-Selective Retinal Ganglion Cells That Project to the Medial Terminal Nucleus

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  • Tobias Ruff, Max Planck Institute of Neurobiology, ETH Zürich
  • ,
  • Christian Peters, Max Planck Institute of Neurobiology
  • ,
  • Akihiro Matsumoto
  • Stephan J. Ihle, ETH Zürich
  • ,
  • Pilar Alcalá Morales, Max Planck Institute of Neurobiology
  • ,
  • Louise Gaitanos, Max Planck Institute of Neurobiology
  • ,
  • Keisuke Yonehara
  • Daniel del Toro, Max Planck Institute of Neurobiology, University of Barcelona
  • ,
  • Rüdiger Klein, Max Planck Institute of Neurobiology

The mammalian retina extracts a multitude of diverse features from the visual scene such as color, contrast, and direction of motion. These features are transmitted separately to the brain by more than 40 different retinal ganglion cell (RGC) subtypes. However, so far only a few genetic markers exist to fully characterize the different RGC subtypes. Here, we present a novel genetic Flrt3-CreERT2 knock-in mouse that labels a small subpopulation of RGCs. Using single-cell injection of fluorescent dyes in Flrt3 positive RGCs, we distinguished four morphological RGC subtypes. Anterograde tracings using a fluorescent Cre-dependent Adeno-associated virus (AAV) revealed that a subgroup of Flrt3 positive RGCs specifically project to the medial terminal nucleus (MTN), which is part of the accessory optic system (AOS) and is essential in driving reflex eye movements for retinal image stabilization. Functional characterization using ex vivo patch-clamp recordings showed that the MTN-projecting Flrt3 RGCs preferentially respond to downward motion in an ON-fashion. These neurons distribute in a regular pattern and most of them are bistratified at the level of the ON and OFF bands of cholinergic starburst amacrine cells where they express the known ON-OFF direction-selective RGC marker CART. Together, our results indicate that MTN-projecting Flrt3 RGCs represent a new functionally homogeneous AOS projecting direction-selective RGC subpopulation.

OriginalsprogEngelsk
Artikelnummer790466
TidsskriftFrontiers in Molecular Neuroscience
Vol/bind14
ISSN1662-5099
DOI
StatusUdgivet - dec. 2021

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